Automatic pistol



April 29, 1930. v. Bou-RTH 1,756,847

AUTOMATIC PISTOL Filed Oct. 24, 1927 2 Sl'xeecs-Shee'fI l wrt :4....

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April 29, 1930. v. BURTH 1,756,847

AUTOMATIC PISTOL Filed Oct. 24, 1927. 2 Sheets-Sheet 2 Patented Apr. 29,1930 PATENT orrore-s VICTOR BOURT'H, OF BOULOGNE' SUR SEINEFRANCEAUTOMATIC PIsToL Application inea october 24, 1927, serial No. 228,460,and in' Belgium october 2:9, 1926.

The present invention relates to improve'-V cyliiidrica'l `rearward"extension of they barrel 15' and` corresponding" wings are provided onthe breech blocksliding therein" which also comprises the central tiringpin and top cover plate.

A further feature of the invention consists su in the factthata'recuperating c oill spring i's disposed between the closing plugandthe bac'k'ac'e ofthe-slidingblock'this sprinzg'having bent portionsformingwings guided' in the' Vsaid internal groovesin the firearm.

Further features of the invention will ap'- p'eai" from the followingdescription' of an embodiment of: an automatic pistol according totlre'inv'entionwhich is illustrated in the accompanyiirg'drawings. I K

Figi l'is a sectional elevation" through the pistol showing themembersin readiness for veine. j -f Y Fig. 2' i's'a'sec'tional elevationshowing the parts at lthe fmomeiitiw'hen lthereleased 'striker .J iis/aboutito act for the cartridge.

Fig.' 3 isa sectional el'evationot the pistolV sh'owir'ig.y tlieparts atthe momentthe recoil is' completed 'while the block is about to' pushoi'wvarclrinv front of it into'the barrel a' new cartridge. y

- Fig; 4:' is aside' view to af largerl scale to' ge `fier with a Viewoit-the back face of the sliding`bl'ock. i K VF' g1 shows't'o a largerscale a plan of the 45@ sliding block and a view ofthev front face.

Fig shows in sectional y'elevation to an en1 large'd scale'aportioi'i'of the back part of the isva'lvi'ew tol an enlarged scale ofthe 50V mechanism for' locking the' sliding block' at' the back part ofthe firearm when the magazine or loader is empty.

Fig. 8 isa viewl to an enlarged scaleoi the spring of the sliding block.

Fig. 9 is a'yiew to any enlarged scale of the tumbler lever.

Fig. 12 is a view topa-n.enlarged scaleshowing the'attachment ofthe'member which ac-Y tuates'the detent lever.

Referring tothedrawings@ is the body or outer part of the firearm, 2 thebarrel. The hack part of the firearm extending to the rear of thebarrel, forms a cylindrical chamber closed by the plug 20.' Upon thesides of this4k chamber are formed longitudinal guiding grooves 23 forthe ribs orstudsfl of the slid;- iiig block'. v

Thissliding block 3 carries the extractor blades 2,6' and, at thecentre, the tiring pin proper 42 provided with the impact head 43.l

In'addition a screen or shutter 28 isl'mounted at its upper' part bythescrew 27 and, at its lower part, in a suitable recess is pivoted at 31al finger or beak 30 the use 'of which will be described hereinafter.The back face of the said block '3 is in contact with a coil spring 5,see 8, comprising wings 44, lodged in the grooves 23 of the tbody. y y

The rear end of this Ispring presses'upon a plugQO fitted into the body.tUpon the back face of the same block 3 is attached ,a spring 6 securedalso tothe 'front face'o the 'striker 4, see VFig. 10, which comprisesat the' front an extension? adapted to come into contact with the headiaiid at the back ay cavity provided with aihooking face 21 upon which'engages the beak 19 of the tumbler lever 17 pivotally mounted at "18upon the plug 20. The strikerv l also comprises guiding wings 22 adaptedto be' displaced in the interior of the loops 44C of the spring 5sliding in the grooves'. The, detentr'od llrf'comprising at its frontend a beak 14 adapted to' engageupon the front tumblerl? ispivot'e'd atlduponV the c face of the blade 12 set at 11 into the trigger pivotallymounted upon the firearm 9 and provided with a return spring 10.

The blade 12 is elastic so as to permit the engagement of the beak 14without causing the release of the beak 19 from the mem ber 4.

A small lever having two arms 24 and 25 is freely pivoted at 23.

The arm 24 is adapted to engage with the stop formed by the finger 30 atthe end of the backward travel of the block 3 in order to swing the arm25 which compels the cartridge case to move out of the claws 2G and jumpthrough the aperture in the firearm which is at this moment uncovered bythe shutter or screen 28, moved backwards.

The sliding block 3 is provided in its lower part with an indent ornotch 32 in which can engage a retaining beak 33 carried by an elasticblade 34 secured at 35 and the free end 36 of which see Fig. 7, isforced upwards by a projection or tappet 37 carried by the platform 38supporting the magazine or loader, all this arrangement being providedfor the purpose of locking at the back the block 3 when the magazine isexhausted, as is the case in Fig. 7.

At ordinary times the blade 34 is situated in the lower position shownin dotted lines and the beak 33 is out of the path of the sliding block3.

At 40 is arranged a spindle carrying a cam 41 and a control knob 48arranged outside the firearm, the object of this arrangement being tocompel, by the rotation of the knob 48, the cam 41 to move down on tothe blade 34 and thus disengage the block 3 in order to permit thesliding block 3 to re-enter into the breech of the firearm, which blockduring its travel takes a cartridge from the loader or magazine replacedin position.

Finally, a safety catch is provided at 47, arranged in such a way as tolock the rod 15 and prevent it being pulled with the effect of producingthe operation of the sear. A screw 45 secures a plate 46, closing thewhole of the back part of the firearm.

The operation of the firearm envisaged forming the subject of thepresent invention l is as follows :-Y

Referring to Fig. 1, a cartridge is engaged in the barrel and thesliding` block 3 is at the end of its forward travel. By operating thetrigger 8 the pull on the rod 15 disengages the striker 4 which, beingthen acted upon by its stressed spring 6 is thrown upon the impact head43 shown in Fig. 2. lVhen the shot is fired the gases push back theblock 3 and the striker, uncovering` the aperture in the body of thefirearm and compressing the spring 5. .At the end of the backward travelthe lower beak 30 of the block 3 pivots the arm 24 and the emptycartridge case is ejected, see Fig. 3. At this moment, if the pressureof the finger is removed from the trigger 8, the striker 4 hooks bymeans of the face 21 upon the beak 19 of the sear lever 17 and thelirearm is ready for firing a fresh cartridge; by pressing upon thetrigger 8, the cycle of operations described above is repeated.

1t is possible, by maintaining the pressure of the linger upon' thetrigger, to fire all the .cartridges in succession, by suitably choosingthe mass of the striker 4, so that it will follow the sliding block 3with a certain time lag when the latter returns forward.

Naturally, other constructional details or modifications may beenvisaged without on that account going` outside the scope of theinvention.

The drawings are given merely by way of example in order to enable theoperation of the automatic pistol envisaged to be understood.

1. An automatic pistol comprising a cylindrical back portion continuingthe barrel and having two longitudinal grooves formed in the sidesthereof, a plug closing the end of said cylinder remote from the barrel,a cylindrical block slidably mounted in said cylindrical portion andcomprising wings corresponding with said grooves, projections andcartridge extracting blades, a firing pin at the centre of said block, ashutter member on the upper part of said block and a screw securing saidmember to the block, said member being also of cylindrical form, a notchin the lower part of said block, a finger pivoted in said notch, anindent in said block and a retaining beak adapted to engage in saidindent.

2. An automatic pistol as claimed in claim 1, further comprising arecuperating coil spring lodged between said closing plug and the rearface of said sliding block, the turns of said spring being bent to formprojections guided in said grooves in the firearm.

3. An automatic pistol as claimedin claim 1, further comprising arecuperating coil spring lodged between said closing plug and the rear'face of said sliding block, the turns of said spring being bent to formprojections guided in said grooves in the firearm, a plateshaped strikerof suitable thickness formed with a striking pin in front and having atthe back a cavity with an internally disposed stopping face.

4. An automatic pistol as claimed in claim l, further comprising arecuperating coil spring lodged between said closing plug and the rearface of said sliding block, the turns of said spring being bent to formprojections guided in said grooves in the firearm, a plateshaped strikerof suitable thickness formed with a striking pin in front and having atthe back a cavity with an internally disposed stopping face, a coilspring connected at one end to the rear face of said sliding block andat the other end to the front face of saidy striker.

5. An automatic pistol as claimed in claim 1, the sear being pivotedupon said closing plug.

6. An automatic pistol as claimed in claim l, furthery comprising atwo-armed lever so arranged that one arm of the lever eXpels the spentcartridge case when theV other arm of said lever is acted upon by saidsliding block.

7. An automatic pistol as claimed in claim l, further comprising a bladespring, a beak on said spring adapted to engage in the indent in saidsliding block when its free end is forced upwards, and a projection uponthe magazine supporting platform whereby said blade is pushed upwards.

8. An automatic pistol as claimed in claim 1, further comprising a bladespring, a beak on said spring, adapted to engage in the indent in saidsliding block when its free end is forced upwards, and a projection uponthe magazine supporting platform whereby said blade is pushed upwards, adisengaging device for said sliding block, formed by a cam adapted to beoperated from the outside and pressing upon said blade spring in orderto disengage then the hooking beak from the indent in the sliding block.

In testimony whereof I have signed my name to this specilication.

VICTOR BOURTH.

